I need to smoothen something, and the smooth tool doesn't help

Hello to all!

I don't know how to describe my problem exactly.

First off I'm a newby to illustrator but I think I know the basics and have spent lost of hours playing around with the program.

I designed the logo of this blog (my blog):
http://gigdoggy.wordpress.com/

Now If you look carefully at the doggy's back, right bellow the neck (upper neck, so on the top of the doggy) you'll notice the path is a tid bit blurry and clearly not as precise as all the other curves (and this is not some pixelisation issue due to the .jpeg image I imported to my blog. This is a problem I have within my vector image in Illustrator).

This is much more apparent when you zoom my doggy-vector image, though it's still pretty subtle. I attached an image of my doggy and indicated with a green loop where my problem was situated.

I don't know how to fix this problem and the smooth tool just smoothens the paths, not the blur. I dont know if this is some sort of pixelisation/aliasing or something (I don't perfectly know the designer's synthax either.

I would really want to get rid of this subtle 'blur' but don't know how to.

Help anyone?

Thanks a lot.